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91 lines
2.9 KiB
Plaintext
91 lines
2.9 KiB
Plaintext
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Install
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How to install HTML Purifier
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Being a library, there's no fancy GUI that will take you step-by-step through
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configuring database credentials and other mumbo-jumbo. HTML Purifier is
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designed to run "out of the box." Regardless, there are still a couple of
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things you should be mindful of.
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0. Compatibility
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HTML Purifier works in both PHP 4 and PHP 5. I have run the test suite on
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these versions:
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- 4.3.9, 4.3.11
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- 4.4.0, 4.4.4
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- 5.0.0, 5.0.4
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- 5.1.0, 5.1.6
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And can confidently say that HTML Purifier should work in all versions
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between and afterwards. HTML Purifier definitely does not support PHP 4.2,
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and PHP 4.3 branch support may go further back than that, but I haven't tested
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any earlier versions.
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I have been unable to get PHP 5.0.5 working on my computer, so if someone
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wants to test that, be my guest. All tests were done on Windows XP Home,
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but operating system is quite irrelevant in this particular case.
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1. Including the proper files
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The library/ directory must be added to your path: HTML Purifier will not be
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able to find the necessary includes otherwise. This is as simple as:
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set_include_path('/path/to/htmlpurifier/library' . PATH_SEPARATOR . get_include_path());
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...replacing /path/to/htmlpurifier with the actual location of the folder. Don't
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worry, HTML Purifier is namespaced so unless you have another file named
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HTMLPurifier.php, the files won't collide with any of your includes.
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Then, it's a simple matter of including the base file:
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require_once 'HTMLPurifier.php';
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...and you're good to go.
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2. Preparing the proper environment
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While no configuration is necessary, you first should take precautions regarding
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the other output HTML that the filtered content will be going along with. Here
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is a (short) checklist:
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* Have I specified XHTML 1.0 Transitional as the doctype?
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* Have I specified UTF-8 as the character encoding?
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I cannot stress the importance of these two bullets enough. Omitting either
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of them could have dire consequences not only for security but for plain
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old usability. You can find a more in-depth discussion of why this is needed
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in docs/security.txt, in the meantime, try to change your output so this is
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the case.
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If, for some reason, you are unable to switch to UTF-8 immediately, you can
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switch HTML Purifier's encoding. Note that the availability of encodings is
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dependent on iconv, and you'll be missing characters if the charset you
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choose doesn't have them.
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$config = HTMLPurifier_Config::createDefault();
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$config->set('Core', 'Encoding', $encoding);
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3. Using the code
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The interface is mind-numbingly simple:
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$purifier = new HTMLPurifier();
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$clean_html = $purifier->purify($dirty_html);
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Or, if you're using the configuration object:
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$purifier = new HTMLPurifier($config);
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$clean_html = $purifier->purify($dirty_html);
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That's it. For more examples, check out docs/examples/. Also, SLOW gives
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advice on what to do if HTML Purifier is slowing down your application.
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